Carbuncle (gemstone)

Carbuncle (/ˈkɑːrbʌŋkəl/) is another name for a deep red almandine gemstone that has been cut with a smooth, convex face in a method called cabochon. Traditionally, the term referred to any red gemstone, most often a red garnet.

Although they share the same linguistic origin, this gemstone should not be confused with the medical term carbuncle, a type of abscess.